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Diodes Incorporated AH372-SA-7
- Part No.:
- AH372-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- SOT-23-3 Flat Leads
- Datasheet:
-
AH372-SA-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,323
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Product details
Overview
AH372-SA-7 from Diodes Incorporated is a bipolar Hall-effect latch sensor in SOT23 package with integrated pullup resistor, 2.2–20 V supply range, -40°C to +125°C operation, and 25 mA sink output. It detects magnetic flux reversal (BOP = 5–60 Gauss, BRP = -60 to -5 Gauss) for rotor position sensing in BLDC motor commutation.
For engineers reviewing the AH372-SA-7 datasheet, AH372-SA-7 pinout, AH372-SA-7 application, or AH372-SA-7 equivalent, this device serves as a high-temperature, single-output magnetic switch with internal regulation and hysteresis-key for contactless RPM monitoring and encoder feedback in automotive and industrial motion control.
Technical Context
The AH372-SA-7 integrates a Hall plate, amplifier, comparator with built-in hysteresis (BHY ≥ 60 Gauss), and open-drain output driver with 7–13 kΩ internal pullup. Its bandgap regulator enables stable operation across 2.2–20 V while compensating for temperature drift.
Magnetic switching is polarity-sensitive: South pole activates output (OUT low) when B > BOP on marking side for SOT23; release occurs at BRP upon field reversal. Output remains latched until field drops below BRP, ensuring noise-immune digital state retention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.2 V to 20 V - supports wide-input industrial and automotive battery rails without external regulation |
| Output Sink Current | 25 mA - directly drives logic inputs or small indicator LEDs without external transistor |
| Operating Temperature | -40°C to +125°C - qualified for under-hood and motor-adjacent placement in automotive systems |
| Magnetic Hysteresis | ≥60 Gauss - prevents chatter during slow or noisy field transitions in rotating machinery |
| Internal Pullup | 7–13 kΩ - eliminates need for external resistor, reducing BOM count and PCB footprint |
| Output On Voltage | ≤400 mV @ 20 mA - ensures clean TTL/CMOS-compatible low-state margin even at full load |
| Supply Current (Off) | 2–4 mA - enables low-power operation in always-on sensing nodes |
Pinout & Package
AH372-SA-7 is housed in a standard SOT23-3 surface-mount package (JEDEC TO-236AB), with 1.30 mm body width, 2.90 mm length, and 0.915 mm height. Pin 1 = VDD, Pin 2 = GND, Pin 3 = OUT (open-drain).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Power supply input | Accepts 2.2–20 V; powers internal regulator, Hall plate, and output stage |
| 2 (GND) | Ground reference | Common return for supply and output sink path; must be low-impedance for noise immunity |
| 3 (OUT) | Digital output terminal | Open-drain output with internal pullup; sinks current when active (low), floats high otherwise |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Requires magnetic polarity reversal to toggle state-ideal for direction-agnostic rotation counting |
| Integrated bandgap regulator | Enables stable internal biasing across full voltage and temperature range, eliminating external LDO dependency |
| High-temperature capability | Specified performance up to +125°C ambient-supports placement near motors, inverters, and power stages |
| No external pullup required | Reduces component count and layout complexity while maintaining consistent rise time and EMI behavior |
| RoHS-compliant & halogen-free | Fully compliant with EU RoHS 3 (2015/863/EU) and Diodes' "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb) |
Applications
| BLDC Motor Commutation | Rotary Encoder Feedback |
|---|---|
|
Use Scenario: Detecting rotor magnet position in 3-phase brushless DC motors for electronic commutation timing. IC Role / Device Role / Timing Role: Hall-effect latch providing synchronized digital edge signals to motor driver logic for phase switching. Use Value: Enables precise 120° electrical sector detection with built-in hysteresis to reject vibration-induced false triggers. |
Use Scenario: Converting mechanical shaft rotation into quadrature or index pulse trains for position tracking. IC Role / Device Role / Timing Role: Magnetic position sensor generating clean, debounced digital pulses per pole pair passage. Use Value: Delivers deterministic edge timing with ≤400 mV on-state voltage, ensuring reliable interface with FPGA or microcontroller capture peripherals. |
| RPM Monitoring System | Contactless Current Switch |
|
Use Scenario: Measuring rotational speed of fans, pumps, or conveyor belts via magnetic target wheel sensing. IC Role / Device Role / Timing Role: Pulse generator triggered by passing ferrous or magnetized gear teeth, feeding frequency-to-digital converter. Use Value: Operates reliably from 2.2 V up to 20 V supply, supporting direct connection to 12 V automotive or 24 V industrial bus rails. |
Use Scenario: Detecting current flow via magnetic field around conductor-used in non-invasive overload protection. IC Role / Device Role / Timing Role: Threshold-based magnetic switch activating protection logic when field exceeds BOP due to overcurrent. Use Value: Internal hysteresis (≥60 Gauss) prevents oscillation during transient overloads, improving system fault tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3724 | Direct successor with improved BOP/BRP stability over temperature and tighter magnetic tolerance (±15% vs ±25%) | Same pinout and function; recommended for new designs requiring AEC-Q100 qualification support | Select AH3724 for production ramp or automotive-grade reliability; AH372-SA-7 remains valid for legacy repair or cost-sensitive industrial use |
| AL372-SR | Same functional spec but in SC59 package (larger thermal mass, higher PD = 230 mW at 25°C) | Better thermal performance in high-ambient environments; requires different footprint and reflow profile | Choose AL372-SR only if board layout allows SC59 and junction temperature margin is critical above 105°C |
Compared with AH3724 and AL372-SR, the AH372-SA-7 offers lowest PCB area and cost among Diodes' latch family while retaining full functionality-but lacks AEC-Q100 documentation and has wider magnetic parameter spread, making it suitable for non-safety-critical industrial motion control.
Availability
AH372-SA-7 is available at Aetrix Electronics and suitable for BLDC motor control, rotary encoders, RPM monitoring, and contactless current switching requiring stable component supply across extended temperature ranges.
Supply support for AH372-SA-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.
The AH372 belongs to Diodes' Hall-effect sensor product line, designed specifically for robust, low-cost magnetic position and speed sensing in harsh thermal and electromagnetic environments.
FAQ
What is the magnetic polarity sensitivity of AH372-SA-7?
The AH372-SA-7 activates (pulls OUT low) when a South pole approaches the marked side of the SOT23 package. Release occurs when field reverses and falls below BRP. This bipolar latch behavior requires polarity reversal-not just field strength change-to toggle output state.
Can AH372-SA-7 operate directly from a 24 V rail?
No-its absolute maximum VDD is 28 V, but recommended operating range is 2.2 V to 20 V. Sustained 24 V operation exceeds specification and risks premature failure. Use a series resistor or LDO to limit VDD to ≤20 V in 24 V systems.
Is an external bypass capacitor required for stable operation?
Yes-a 100 nF ceramic capacitor between VDD and GND is recommended per the datasheet to stabilize the internal regulator and improve noise immunity, especially in electrically noisy motor drive environments.
Does AH372-SA-7 support AEC-Q100 qualification?
No-the AH372-SA-7 is not AEC-Q100 qualified. Diodes recommends the AH3724 for automotive applications requiring AEC-Q100 compliance, PPAP capability, and IATF 16949 manufacturing certification.
AH372-SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-3 Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- 5mT Trip, -5mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.2V ~ 20V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 25mA
- Output Type:
- Analog Voltage
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23F
AH372-SA-7 FAQ
1.How can I place an order for AH372-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH372-SA-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AH372-SA-7 reliable?
The price and inventory of AH372-SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH372-SA-7 is usually 5 days.
3.What payment methods are accepted for AH372-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH372-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH372-SA-7?
AH372-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH372-SA-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AH372-SA-7?
For technical support, including AH372-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH372-SA-7 requirements.
6.How does Aetrix verify that AH372-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH372-SA-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AH372-SA-7 meets industry standards.
7.What is the process for return or replacement of AH372-SA-7?
All AH372-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH372-SA-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AH372-SA-7 part is unused and in its original packaging.
Return procedure for AH372-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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